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<?php $array = [['range' => 336, 'year' => 2020],['range' => 336, 'year' => 2020],['range' => 390, 'year' => 2020],['range' => 390, 'year' => 2021]]; $idList = array_flip(array_values(array_unique(array_column($array, 'range')))); $newDatesCurrent = []; foreach($array as $value) { $newDatesCurrent[] = ['range' => $idList[$value['range']], 'year' => $value['year'], 'month' => 222]; } print_r($newDatesCurrent);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [range] => 0 [year] => 2020 [month] => 222 ) [1] => Array ( [range] => 0 [year] => 2020 [month] => 222 ) [2] => Array ( [range] => 1 [year] => 2020 [month] => 222 ) [3] => Array ( [range] => 1 [year] => 2021 [month] => 222 ) )

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